def from_tracks(cls, tracks):
"""given a sorted list of AudioFile objects,
returns DiscID for those tracks as if they were a CD"""
from audiotools import has_pre_gap_track
from audiotools.freedb import DiscID as FDiscID
if not has_pre_gap_track(tracks):
offsets = [0]
for track in tracks[0:-1]:
offsets.append(offsets[-1] + track.cd_frames())
return cls(track_numbers=range(1,
len(tracks) + 1),
track_offsets=offsets,
lead_out_offset=sum(t.cd_frames() for t in tracks),
freedb_disc_id=FDiscID.from_tracks(tracks))
else:
offsets = [tracks[0].cd_frames()]
for track in tracks[1:-1]:
offsets.append(offsets[-1] + track.cd_frames())
return cls(track_numbers=range(1, len(tracks)),
track_offsets=offsets,
lead_out_offset=sum(t.cd_frames() for t in tracks),
freedb_disc_id=FDiscID.from_tracks(tracks))
def from_tracks(cls, tracks):
"""given a sorted list of AudioFile objects,
returns DiscID for those tracks as if they were a CD"""
from audiotools import has_pre_gap_track
from audiotools.freedb import DiscID as FDiscID
if not has_pre_gap_track(tracks):
offsets = [0]
for track in tracks[0:-1]:
offsets.append(offsets[-1] + track.cd_frames())
return cls(track_numbers=range(1, len(tracks) + 1),
track_offsets=offsets,
lead_out_offset=sum(t.cd_frames() for t in tracks),
freedb_disc_id=FDiscID.from_tracks(tracks))
else:
offsets = [tracks[0].cd_frames()]
for track in tracks[1:-1]:
offsets.append(offsets[-1] + track.cd_frames())
return cls(track_numbers=range(1, len(tracks)),
track_offsets=offsets,
lead_out_offset=sum(t.cd_frames() for t in tracks),
freedb_disc_id=FDiscID.from_tracks(tracks))
def from_cddareader(cls, cddareader):
"""given a CDDAReader object, returns a DiscID for that object"""
from audiotools.freedb import DiscID as FDiscID
offsets = cddareader.track_offsets
return cls(track_numbers=list(sorted(offsets.keys())),
track_offsets=[(offsets[k] // 588) for k in
sorted(offsets.keys())],
lead_out_offset=cddareader.last_sector + 1,
freedb_disc_id=FDiscID.from_cddareader(cddareader))
def from_cddareader(cls, cddareader):
"""given a CDDAReader object, returns a DiscID for that object"""
from audiotools.freedb import DiscID as FDiscID
offsets = cddareader.track_offsets
return cls(track_numbers=list(sorted(offsets.keys())),
track_offsets=[(offsets[k] // 588)
for k in sorted(offsets.keys())],
lead_out_offset=cddareader.last_sector + 1,
freedb_disc_id=FDiscID.from_cddareader(cddareader))
def freedb_disc_id(self):
"""returns a FreeDB DiscID object"""
from audiotools.freedb import DiscID
PTS_PER_FRAME = DVDAudio.PTS_PER_SECOND // 75
offsets = [150]
for track in self.tracks[0:-1]:
offsets.append(offsets[-1] + (track.pts_length // PTS_PER_FRAME))
return DiscID(offsets=offsets,
total_length=self.pts_length // DVDAudio.PTS_PER_SECOND,
track_count=len(self))
def from_sheet(cls, sheet, total_pcm_frames, sample_rate):
"""given a Sheet object
length of the album in PCM frames
and sample rate of the disc,
returns a DiscID for that CD"""
from audiotools.freedb import DiscID as FDiscID
return cls(track_numbers=range(1, len(sheet) + 1),
track_offsets=[(int(t.index(1).offset() * 75))
for t in sheet],
lead_out_offset=total_pcm_frames * 75 // sample_rate,
freedb_disc_id=FDiscID.from_sheet(sheet,
total_pcm_frames,
sample_rate))
def from_sheet(cls, sheet, total_pcm_frames, sample_rate):
"""given a Sheet object
length of the album in PCM frames
and sample rate of the disc,
returns a DiscID for that CD"""
from audiotools.freedb import DiscID as FDiscID
return cls(track_numbers=range(1,
len(sheet) + 1),
track_offsets=[(int(t.index(1).offset() * 75))
for t in sheet],
lead_out_offset=total_pcm_frames * 75 // sample_rate,
freedb_disc_id=FDiscID.from_sheet(sheet, total_pcm_frames,
sample_rate))
def musicbrainz_disc_id(self):
"""returns a MusicBrainz DiscID object"""
from audiotools.musicbrainz import DiscID
PTS_PER_FRAME = DVDAudio.PTS_PER_SECOND // 75
offsets = [150]
for track in self.tracks[0:-1]:
offsets.append(offsets[-1] + (track.pts_length // PTS_PER_FRAME))
return DiscID(first_track_number=1,
last_track_number=len(self),
lead_out_offset=self.pts_length // PTS_PER_FRAME,
offsets=offsets)
